<?php
// +----------------------------------------------------------------------+
// | PHP Version 4														|
// +----------------------------------------------------------------------+
// | Copyright (c) 1997-2004 The PHP Group								|
// +----------------------------------------------------------------------+
// | This source file is subject to version 3.0 of the PHP license,	   |
// | that is bundled with this package in the file LICENSE, and is		|
// | available at through the world-wide-web at						   |
// | http://www.php.net/license/3_0.txt.								  |
// | If you did not receive a copy of the PHP license and are unable to   |
// | obtain it through the world-wide-web, please send a note to		  |
// | license@php.net so we can mail you a copy immediately.			   |
// +----------------------------------------------------------------------+
// | Authors: Philippe Jausions <Philippe.Jausions@11abacus.com>		  |
// |		  Aidan Lister <aidan@php.net>								|
// +----------------------------------------------------------------------+
//
// $Id: version_compare.php,v 1.1 2005/07/11 16:34:36 ggiunta Exp $


/**
 * Replace version_compare()
 *
 * @category	PHP
 * @package	 PHP_Compat
 * @link		http://php.net/function.version_compare
 * @author	  Philippe Jausions <Philippe.Jausions@11abacus.com>
 * @author	  Aidan Lister <aidan@php.net>
 * @version	 $Revision: 1.1 $
 * @since	   PHP 4.1.0
 * @require	 PHP 4.0.0 (user_error)
 */
if (!function_exists('version_compare')) {
	function version_compare($version1, $version2, $operator = '<')
	{
		// Check input
		if (!is_scalar($version1)) {
			user_error('version_compare() expects parameter 1 to be string, ' .
				gettype($version1) . ' given', E_USER_WARNING);
			return;
		}

		if (!is_scalar($version2)) {
			user_error('version_compare() expects parameter 2 to be string, ' .
				gettype($version2) . ' given', E_USER_WARNING);
			return;
		}

		if (!is_scalar($operator)) {
			user_error('version_compare() expects parameter 3 to be string, ' .
				gettype($operator) . ' given', E_USER_WARNING);
			return;
		}

		// Standardise versions
		$v1 = explode('.',
			str_replace('..', '.',
				preg_replace('/([^0-9\.]+)/', '.$1.',
					str_replace(array('-', '_', '+'), '.',
						trim($version1)))));

		$v2 = explode('.',
			str_replace('..', '.',
				preg_replace('/([^0-9\.]+)/', '.$1.',
					str_replace(array('-', '_', '+'), '.',
						trim($version2)))));

		// Replace empty entries at the start of the array
		while (empty($v1[0]) && array_shift($v1)) {}
		while (empty($v2[0]) && array_shift($v2)) {}

		// Release state order
		// '#' stands for any number
		$versions = array(
			'dev'   => 0,
			'alpha' => 1,
			'a'	 => 1,
			'beta'  => 2,
			'b'	 => 2,
			'RC'	=> 3,
			'#'	 => 4,
			'p'	 => 5,
			'pl'	=> 5);

		// Loop through each segment in the version string
		$compare = 0;
		for ($i = 0, $x = min(count($v1), count($v2)); $i < $x; $i++) {
			if ($v1[$i] == $v2[$i]) {
				continue;
			}
			$i1 = $v1[$i];
			$i2 = $v2[$i];
			if (is_numeric($i1) && is_numeric($i2)) {
				$compare = ($i1 < $i2) ? -1 : 1;
				break;
			}
			// We use the position of '#' in the versions list
			// for numbers... (so take care of # in original string)
			if ($i1 == '#') {
				$i1 = '';
			} elseif (is_numeric($i1)) {
				$i1 = '#';
			}
			if ($i2 == '#') {
				$i2 = '';
			} elseif (is_numeric($i2)) {
				$i2 = '#';
			}
			if (isset($versions[$i1]) && isset($versions[$i2])) {
				$compare = ($versions[$i1] < $versions[$i2]) ? -1 : 1;
			} elseif (isset($versions[$i1])) {
				$compare = 1;
			} elseif (isset($versions[$i2])) {
				$compare = -1;
			} else {
				$compare = 0;
			}

			break;
		}

		// If previous loop didn't find anything, compare the "extra" segments
		if ($compare == 0) {
			if (count($v2) > count($v1)) {
				if (isset($versions[$v2[$i]])) {
					$compare = ($versions[$v2[$i]] < 4) ? 1 : -1;
				} else {
					$compare = -1;
				}
			} elseif (count($v2) < count($v1)) {
				if (isset($versions[$v1[$i]])) {
					$compare = ($versions[$v1[$i]] < 4) ? -1 : 1;
				} else {
					$compare = 1;
				}
			}
		}

		// Compare the versions
		if (func_num_args() > 2) {
			switch ($operator) {
				case '>':
				case 'gt':
					return (bool) ($compare > 0);
					break;
				case '>=':
				case 'ge':
					return (bool) ($compare >= 0);
					break;
				case '<=':
				case 'le':
					return (bool) ($compare <= 0);
					break;
				case '==':
				case '=':
				case 'eq':
					return (bool) ($compare == 0);
					break;
				case '<>':
				case '!=':
				case 'ne':
					return (bool) ($compare != 0);
					break;
				case '':
				case '<':
				case 'lt':
					return (bool) ($compare < 0);
					break;
				default:
					return;
			}
		}

		return $compare;
	}
}

?>